/**
 * Copyright 2009-2018 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.submitted.enum_interface_type_handler;

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedTypes;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

@MappedTypes(HasValue.class)
public class HasValueEnumTypeHandler<E extends Enum<E> & HasValue> extends
		BaseTypeHandler<E> {
	private final E[] enums;
	private Class<E> type;

	public HasValueEnumTypeHandler(Class<E> type) {
		if (type == null)
			throw new IllegalArgumentException("Type argument cannot be null");
		this.type = type;
		this.enums = type.getEnumConstants();
		if (!type.isInterface() && this.enums == null)
			throw new IllegalArgumentException(type.getSimpleName()
					+ " does not represent an enum type.");
	}

	@Override
	public void setNonNullParameter(PreparedStatement ps, int i, E parameter,
									JdbcType jdbcType) throws SQLException {
		ps.setInt(i, parameter.getValue());
	}

	@Override
	public E getNullableResult(ResultSet rs, String columnName)
			throws SQLException {
		int value = rs.getInt(columnName);
		if (rs.wasNull()) {
			return null;
		}
		for (E enm : enums) {
			if (value == enm.getValue()) {
				return enm;
			}
		}
		throw new IllegalArgumentException("Cannot convert "
				+ value + " to " + type.getSimpleName());
	}

	@Override
	public E getNullableResult(ResultSet rs, int columnIndex)
			throws SQLException {
		int value = rs.getInt(columnIndex);
		if (rs.wasNull()) {
			return null;
		}
		for (E enm : enums) {
			if (value == enm.getValue()) {
				return enm;
			}
		}
		throw new IllegalArgumentException("Cannot convert "
				+ value + " to " + type.getSimpleName());
	}

	@Override
	public E getNullableResult(CallableStatement cs, int columnIndex)
			throws SQLException {
		int value = cs.getInt(columnIndex);
		if (cs.wasNull()) {
			return null;
		}
		for (E enm : enums) {
			if (value == enm.getValue()) {
				return enm;
			}
		}
		throw new IllegalArgumentException("Cannot convert "
				+ value + " to " + type.getSimpleName());
	}
}
